19.把9.954四舍五入到十分位的近似数的值是( )
A. | 9.9 | B. | 10.0 | C. | 10 |
17.
0 161099 161107 161113 161117 161123 161125 161129 161135 161137 161143 161149 161153 161155 161159 161165 161167 161173 161177 161179 161183 161185 161189 161191 161193 161194 161195 161197 161198 161199 161201 161203 161207 161209 161213 161215 161219 161225 161227 161233 161237 161239 161243 161249 161255 161257 161263 161267 161269 161275 161279 161285 161293 199269
脱式计算(能简便计算的要简便计算) 1.96-3.2×0.5+0.4 | 0.27+0.27×0.37+0.27×0.63 | 9.68×101 |
12.5×4×2.5×12 | 9.6÷(9.6×4) | 0.78÷0.25÷4. |